A multi-arc optical imaging inner hole diameter measuring device and method

Abstract

The invention belongs to the field of precision measurement of geometric quantities, and specifically discloses a multi-arc segment optical imaging inner hole diameter measurement device and method, which includes a ring laser generator component, an optical imaging component, an n-face pyramid reflector and a frame, wherein Ring laser generator components, optical imaging components and n-face pyramid reflectors are installed coaxially inside the cylindrical frame. The ring laser generator components include laser generators, focusing lenses and conical reflectors installed coaxially in sequence. The imaging component includes an optical image sensor and an optical lens group coaxially installed in turn, and the frame has a light opening at the conical reflector and n-face pyramid reflector; when measuring, the reflection is formed by the conical reflector and n-face pyramid reflector. The optical path, and the optical imaging component images the ring-shaped spot formed by the laser in the inner hole of the workpiece to be measured, and then calculates the diameter of the inner hole of the workpiece to be measured; the device has high measurement accuracy, good stability, easy operation, and has broad application prospects.

Description

technical field [0001] The invention belongs to the field of precision measurement of geometric quantities, and more specifically relates to a device and method for measuring the diameter of a multi-arc optical imaging inner hole. Background technique [0002] As a commonly used structure, the hollow tube structure is used in all walks of life in society, from artillery in the military, to hydraulic cylinders, oil well pumps in industrial production, and transportation pipes in daily life, etc. Inner hole parts have been widely used . Due to reasons such as environment, processing and use, it is often necessary to measure the diameter of the inner hole. The inner diameter of the hole part changes and the performance of the part decreases, which affects its safety in use, especially the gun barrel. When the inner diameter changes, its shooting accuracy changes, which has a great impact on actual use. [0003] In response to the above problems, non-contact measurement techno...

AI Technical Summary

Problems solved by technology

Due to reasons such as environment, processing and use, it is often necessary to measure the diameter of the inner hole. The inner diameter of the hole parts changes and the performance of the parts decreases, which affects its safety in use, especially the gun barrel. When the inner diameter changes, its shooting accuracy changes, which has a great impact on actual use

[0003] In response to the above problems, non-contact measurement technology and photoelectric measurement devices have been produced, including photoelectric imaging measurement technology associated with CCD and COMS (both image sensors), for example: in the literature "Photoelectric Gun Barrel Sight Detection System [J]. "Journal of Aircraft Measurement and Control, 2000, 19 (3)" uses a stepping motor to drive an external measuring rod. Through the control of the stepping motor, it drives the displacement and rotation of the CCD camera at the front end of the measuring rod to achieve accurate detection of the inner bore of the gun barrel. The movement structure of the device is complicated, and it cannot measure the diameter of inner hole parts; Combining the laser and the CCD camera, the rifling size can be obtained by collecting the annular laser image on the section of the inner hole for data analysis. However, this device uses a conical mirror for full-view reflection imaging. Due to the large tangential size reduction, the actual imaging ratio Too small, the resolution of tangential measurement is low, and there will be large errors in measurement results and poor repeatability

[0004] In summary, the accuracy and repeatability of the measurement results of the machine vision qualitative and quantitative detection system with CCD and COMS imaging technology for internal hole parts measurement devices need to be improved. Therefore, it is necessary to study a high-precision, portable, high-reliability Measuring device for inner hole diameter and corresponding method

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